EP0224775A1 - Four à micro-ondes encastrable - Google Patents

Four à micro-ondes encastrable Download PDF

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Publication number
EP0224775A1
EP0224775A1 EP86115825A EP86115825A EP0224775A1 EP 0224775 A1 EP0224775 A1 EP 0224775A1 EP 86115825 A EP86115825 A EP 86115825A EP 86115825 A EP86115825 A EP 86115825A EP 0224775 A1 EP0224775 A1 EP 0224775A1
Authority
EP
European Patent Office
Prior art keywords
cavity
air
microwave
door
microwave oven
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86115825A
Other languages
German (de)
English (en)
Inventor
Ruggero Roccari
Walter Zanzani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Industrie Zanussi SpA
Original Assignee
Industrie Zanussi SpA
Zanussi Elettrodomestici SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Industrie Zanussi SpA, Zanussi Elettrodomestici SpA filed Critical Industrie Zanussi SpA
Publication of EP0224775A1 publication Critical patent/EP0224775A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/666—Safety circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/6402—Aspects relating to the microwave cavity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/642—Cooling of the microwave components and related air circulation systems
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/76—Prevention of microwave leakage, e.g. door sealings
    • H05B6/766—Microwave radiation screens for windows

Definitions

  • the invention relates to a microwave cooking oven of the installation module type for domestic use adapted to be included in composable kitchen furniture.
  • Microwave cooking ovens generally present various functional problems requiring specific solutions.
  • the main problems derive from the necessity of cooling the microwave generator components, of preventing the escape of microwaves to the environment of the oven, and of eliminating condensates developing in the oven chamber during the cooking of certain types of foods.
  • the air used for cooling the microwave generator and associated control components is usually directed into the oven chamber through suitable conduits, part of this air being in some cases deflected towards a rotatable reflector or agitator for causing it to rotate.
  • This air is aspirated from the environment and put into circulation by means of a power-driven fan, and subsequently leaves the oven chamber, together with entrained condensates, through discharge con­duits located at the rear of the oven and provided with sealing means preventing the escape of microwaves.
  • Known microwave ovens of the installation type are there­fore provided with suitable conduits leading from an open­ing in the rear wall of the oven chamber to louvres formed at the front above the oven.
  • These conduits extend exter­iorly of and above the oven chamber, resulting in a more complicated construction and certain functional disadvant­ages.
  • These conduits in fact represent an indispensable accessory to be separately mounted as the oven is being installed, and cause a noticable pressure drop in the air flow towards the outlet; in addition, the air outlet louvres impose a considerable limitation on the height of the door and thus also of the oven chamber.
  • the main object of the invention is thus the provision of a microwave oven of the installation type which is of simplified construction and simple and reliable perform­ance.
  • the invention is thus intended to provide an oven designed to be readily installed in a composable assembly without requiring particular accessories for the circul­ation of the air entraining cooking vapours and for camou­flaging the air outlet, in place of which the respective components are to be incorporated in the oven itself, so that the appearance of the complete oven structure is in harmony with that of the surrounding furniture.
  • a microwave oven of the installation type for domestic use comprising a cavity for containing foods to be cooked, a door provided with a handle for closing the cavity, a microwave gener­ator and associated agitator connected to the cooking cav­ity, and means including a fan and associated air conduit for cooling the microwave generator, the oven being characterized in that the cooking cavity is directly connected to the cooling air intake conduit and that the discharge of the air from the cavity takes place through front openings associated to the handle and provided with sealing means preventing escape of microwaves disposed in a corresponding part of the door.
  • the microwave oven shown in the drawings generally comprises a cooking cavity or chamber 10 having a front wall 9 closed by a door 11.
  • a microwave generator magnet
  • an asso­ciated power-driven fan 13 for aspirating ambient air and directing it through a conduit 14 for cooling magnetron 12.
  • the latter is connected, by way of a waveguide 15, to a chamber 16 housing a rotatable microwave reflector or agitator 17.
  • Waveguide 15 and agitator chamber 16 are dis­posed above cooking cavity 10, chamber 16 communicating with cavity 10 through connecting passages (not shown).
  • cooling air conduit 14 is ex­tended beyond magnetron 12 and branches into a first branch 18 opening tangentially into chamber 16 of agitator 17, and a second branch 19 opening directly into cooking cavity 10.
  • Cavity 10 communicates through passages 30 (fig. 2) with a discharge conduit 20 disposed thereabove at a suitable pos­ition and formed with outlet openings 21 in front face 9 of the oven.
  • Discharge conduit 20 is preferably mounted at a lateral position with respect to cooking cavity 10 (fig.1) at a location diametrally opposite the opening of conduit branch 19.
  • This arrangement is not, however, strictly unalterable, as it depends on the geometry of cavity 10 and on the relative positions of the functional components of the oven, that is to say, it is to be defined in manner to ensure the most efficient circulation of the air within cavity 10 as indic­ated by arrows in the drawings so as to evacuate therefrom the vapours formed during the cooking of foods.
  • the direct discharge of the air at the front face of the oven should be suitably controlled so as to prevent the simultaneous escape of microwaves.
  • door 11 to be suitably modified.
  • door 11 is usually composed of a metal frame 22 having a suitable shaped boundary for forming a microwave trap 23, a perforate panel permitting inspection of the interior of the oven, and inner and outer window panes 24 and 25 secured to the frame.
  • Door 11 is additionally provided with a handle 27.
  • the modification of door 11 with respect to the described conventional construction comprises an upwards directed extension 28 of frame 22.
  • Extension 28 extends in front of outlet 21 of discharge conduit 20 and is provided with openings dimensioned and positioned so as to prevent micro­waves from passing therethrough.
  • the dimensions of the openings have to be smaller than one-fourth of the wavelength of the microwave radiation.
  • This solution permits the provision also in the upper part of the oven of a microwave trap for a suitable wavelength for preventing any microwaves from escaping through the food charging opening of cavity 10.
  • This problem is solved in the traditional manner along the lateral and lower bound­aries of the oven, where there are no openings for the discharge of air, so that the required microwave trap may be formed by the door frame and the borders of the door opening of the cooking cavity.
  • the oven according to the invention thus attains the stated objects. Above all it constitutes a complete and compact unit capable of being pre-assembled and subsequently in­ stalled in a piece of kitchen furniture without requiring the addition of accessory elements such as conduits for the circulation and discharge of air.
  • the removal of vapours from the cooking cavity is ensured in a particularly efficient manner, because the major part of the air is directly directed into the cavity at an elevated pressure thanks to the reduction of the length of the connecting conduits and the corresponding pressure losses.
  • the air is finally discharged at the front, thus eliminating the excessive space requirements in a piece of furniture in the case of a rear-mounted exhaust stack.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electric Ovens (AREA)
EP86115825A 1985-11-28 1986-11-14 Four à micro-ondes encastrable Withdrawn EP0224775A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3410485U 1985-11-28
IT3410485U IT209172Z2 (it) 1985-11-28 1985-11-28 Forno a microonde da incasso.

Publications (1)

Publication Number Publication Date
EP0224775A1 true EP0224775A1 (fr) 1987-06-10

Family

ID=11239253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86115825A Withdrawn EP0224775A1 (fr) 1985-11-28 1986-11-14 Four à micro-ondes encastrable

Country Status (2)

Country Link
EP (1) EP0224775A1 (fr)
IT (1) IT209172Z2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001049078A1 (fr) * 1999-12-27 2001-07-05 Lg Electronics Inc. Four a micro-ondes encastre
EP1220575A2 (fr) * 2000-12-30 2002-07-03 Lg Electronics Inc. Structure de ventilation dans un four à micro-ondes et la structure d'accueil d'une lampe associée

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1160884A (en) * 1965-11-04 1969-08-06 Microtherm Ltd Improvements in and relating to Heating Apparatus
US3679855A (en) * 1971-06-11 1972-07-25 Gen Electric Protective barriers for window of microwave oven door
US3681557A (en) * 1969-10-23 1972-08-01 Mitsubishi Electric Corp Electronic cooking apparatus
US3783219A (en) * 1970-11-11 1974-01-01 Sharp Kk Air cooled microwave cooking oven and door
EP0003764A1 (fr) * 1978-02-14 1979-09-05 Bosch-Siemens HausgerÀ¤te GmbH Four de cuisson double, en particulier four de cuisson encastré
US4184945A (en) * 1978-06-12 1980-01-22 Litton Systems, Inc. Microwave wall oven air flow system
US4369347A (en) * 1980-04-09 1983-01-18 Sharp Kabushiki Kaisha Damper activation in a combined microwave and electric heating oven

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1160884A (en) * 1965-11-04 1969-08-06 Microtherm Ltd Improvements in and relating to Heating Apparatus
US3681557A (en) * 1969-10-23 1972-08-01 Mitsubishi Electric Corp Electronic cooking apparatus
US3783219A (en) * 1970-11-11 1974-01-01 Sharp Kk Air cooled microwave cooking oven and door
US3679855A (en) * 1971-06-11 1972-07-25 Gen Electric Protective barriers for window of microwave oven door
EP0003764A1 (fr) * 1978-02-14 1979-09-05 Bosch-Siemens HausgerÀ¤te GmbH Four de cuisson double, en particulier four de cuisson encastré
US4184945A (en) * 1978-06-12 1980-01-22 Litton Systems, Inc. Microwave wall oven air flow system
US4369347A (en) * 1980-04-09 1983-01-18 Sharp Kabushiki Kaisha Damper activation in a combined microwave and electric heating oven

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001049078A1 (fr) * 1999-12-27 2001-07-05 Lg Electronics Inc. Four a micro-ondes encastre
US6528774B2 (en) 1999-12-27 2003-03-04 Lg Electronics Inc. Built-in microwave oven
EP1220575A2 (fr) * 2000-12-30 2002-07-03 Lg Electronics Inc. Structure de ventilation dans un four à micro-ondes et la structure d'accueil d'une lampe associée
EP1220575A3 (fr) * 2000-12-30 2004-03-03 Lg Electronics Inc. Structure de ventilation dans un four à micro-ondes et la structure d'accueil d'une lampe associée

Also Published As

Publication number Publication date
IT209172Z2 (it) 1988-09-16
IT8534104V0 (it) 1985-11-28

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Effective date: 19900215

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Inventor name: ROCCARI, RUGGERO

Inventor name: ZANZANI, WALTER